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 have the effect at any time of divesting or impairing the
 title and interests of Lessor as owner and any Financing Party
 as mortgagee of such Engine.

 Lessee shall obtain from the lessor of any airframe on which an
 Engine is installed and from any holder of a Security Interest in
 any airframe on which an Engine is installed, an agreement (which
 may be in the form of a relevant clause in any lease agreement,
 mortgage, security agreement or similar agreement in respect of such
 airframe) in writing for the benefit of the Lessor (or directly with
 the Lessor) that such Person will respect the interests of Lessor as
 owner and lessor, respectively, and of the Financing Parties, in
 such Engine and will not acquire or claim any right, title or
 interest in such Engine as a result of such Engine being installed
 on such other airframe at any time while such Engine is subject to
 this Agreement. Provided Lessee shall have received from a lessor of
 or secured party holding a Security Interest in any airframe leased
 to Lessee or owned by Lessee and subject to a Security Interest
 under such an agreement, Lessor hereby agrees for the benefit of
 such lessor or secured party that Lessor will not acquire or claim
 as against such lessor or secured party, any rights, title or
 interest in any engine covered by such lease or Security Interest as
 a result of any such engine being installed on the Airframe at any
 time while such engine is subject to such lease or Security
 Interest.

 8.15 REMOVAL AND INTERCHANGE OF PARTS:

 Lessee will, subject to Clause 8.16:

 (a) ensure that no Part is at any time removed from the Aircraft
 unless it is promptly replaced by a part complying with Clause
 8.13(b);